Medinger, M
Krenger, W
Jakab, A
Halter, J
Buser, A http://orcid.org/0000-0002-7942-6746
Bucher, C
Passweg, J
Tzankov, A http://orcid.org/0000-0002-1100-3819
Article History
Received: 9 March 2015
Revised: 25 June 2015
Accepted: 10 July 2015
First Online: 24 August 2015
Competing interests
: The authors declare no conflict of interest.